1. Backed out previous "? children" changes.
2. If bridge, call getChildCount on the applicable asset (batching those assets with the same parent) and use that as child count.
3. Allow setting of an itemRefiner in the asset finder's options, allowing items to be modified before display on an asset finder request level.
   eg. an image plugin that wants image varieties to be selected may unselect the "dependant" flag on image varieties, that currently stop it from being selected.